I think you have two choices, raise both speakers using, simply, a piece of wood to place them on - you'll have to find the appropriate height that works for your listening position. Or you can try to tilt them up - that's more complicated... The Beolab 20s are tilted ever so slightly up so that the acoustic lens isn't at a perfect parallel to the ground, maybe a couple of degrees, but enough to notice. Perhaps you might want to try to plane a piece of wood on one side, and then cut it at a 2-3-degree angle on the other side and place the Beolab 5 on the wood so that the entire speaker is tilted up slightly so that the lenses are aligned to your ears in your favored seating position.

In both cases, when you have found the appropriate height, or angle you might cut the wood to circles and painted black or gray so that they're not noticeable as bases for your wonderful speakers. I'd also perhaps place rubber backing on either side of the wood so that the speakers are firmly planted on their new bases.

You can't tilt them safely because the base is perfectly round, so raising them up on platforms would be the obvious choice. However, the 15" woofer is designed for floor coupling, so even after recalibration it will probably not sound like it did before you raised them.

hi, wouldn't some prefab concrete round garden tiles do the trick? maybe the underside lined with felt to not damage the floor? could look acceptable (depending on your interior)

the advantage of concrete would be the weight - less easy to blow away with the mighty 5s!

So would the sound and base not be affected. What about if i angle the concrete?

Some time ago someone on Beoworld put some concrete or stone paving tiles under their BL5s, not to raise them, though it did that, but to help with the bass. They had a suspended floor and it was not rigid enough to allow good bass response, so the mass helped greatly. If you do this, definitely run the calibration again.

Hi,

I have used concrete breezeblocks under my Penta III speakers for several years now, both to raise the tweeters by 200mm and to mass-load the speakers as they are on a suspended wooden floor.  It works wonders for the sound.

The same approach could be used with Beolab 5 without any problems as far as I can see, but (as mentioned previously) the speakers MUST be level, not tilted for safety and sound quality to be preserved.

Kind regards, Steve.